Electromagnetic switch



March 1o. 1925. 1 529 638 H. W. CHENEY ELECTROMAGNETIC SWITCH F ed April 7, 1921 15 Sheets-Sheet 1 l i dwllllll um! IM! March 10. 1925.

H. w. CHENEY ELECTROMAGNETIC SWITCH Filed April '7, 1921 3 Sheets-Sheet 2 Mrch 10. 1925. 1,529,638-

H, W. CHENEY ELEGTROMAGNETIC SWITCH Filed April 7, 1921 A 3 t 3 v Patented Mar. 10, 1925.

` UNITED STATES HERBERT W. CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS MANUFACTURING COMPANY, DELAWARE.

OF MILWAUKEE, lWISCONSIN, A. CORPORATION OF ELECTROMAGNETIC SWITCH.

Application filed April 7,

To all whom t may concern.'

Be it known that HERBERT W. CHENEY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee ant State of lVisconsin, has invented a certain new and useful Improvement in Electromagnetic Switches, of which the following is a specification.

This invention relates in general to electromagnetic switches.

One of the objects of the invention is the provision of a simple and eiiicient electromagnetic switch, and more specifically, a switch of the double-throw type. A further object of the invention is the provision of a toggle operated double-throw switch.

A still further object of the invention is the provision of means for adjusting the setting of the toggles. Other objects will appear hereinafter as the description of the invention proceeds.

The novel features of the invention will be set forth in this specification and the accompanying drawings forming a part thereof, and disclosing one embodiment of the invention and all these novel features arev intended to be pointed out in the claims.

In the drawings, Fig. 1 is a front elevation of an electromagnetic switch embodying the features of the invention, the parts being shown in the open circuitposition;

Fig. 2 is a view similar to Fig. 1, the. parts being shown in one of the circuit closing positions;

Fig. 3 is a fragmentary side elevation of the disclosed switch the parts being in the position shown in Fig. 2.

The electromagnetic switch shown is provided with a switch member 1 carrying a 40 contact 2 which is preferablyT mounted for pivotal movement on the pivot 3 carried by the member 1 and biased to the position shown in Fig. 1, with respect to member 1, by spring 54. The switch member 1 is rigidly asssociated with and insulated from a square floating shaft 4, by means of the clamp 5. The shaft 4 also has rigidly associated therewith an extension member 6, which preferably extends in a direction op- 50 posite from that of the switch member 1.

The member 6 is provided with a pivot pin 7 with which the link 8 is pivotally associated. The other end of the link 8 is swingable about the stationary pivot 9. The

1921. Serial No. 459,302.

pivot 9 may be carried by any member as for example, idly associated with the tromagnetic switch.

The shaft 4 is provided with a pintle 10 with which is pivotally associated a crank 11. The crank 11 is rigidly associated with a square shaft 12 having a round end journaled in the end plate 13. The shaft 12 also has rigidly associated therewith a bell crank lever 14 comprising' the arms 15, 16. The crank 11 forms a bell crank with either arm 15 or arm 16. The arm 15 is provided with a pivot 17 with which is associated a toggle link 18. The arm 16 is provided with a pivot 19 with which is associated a. toggle link 20. An actuating lever 21 is operatively associated with the toggle links 18. 2O by means of a pin 22 carried by said ac; tuating lever, the pin 22 being operable in the slots 23, 24 formed in the toggle links 18, 20 respectively. The length of the slot 23 is such that the end nearest the pivot 17 is within the boundary of the actuating lever 21 and preferably in such a position within said boundary that when the actuating lever is 1n open circuit position (that is the position shown in Fig. 1, where the general axis of said lever substantially bisects the angle between the arms 15, 16) the pin 22 will be just in contact with the end of said slot. The slot 24 in the toggle link 2O is preferably formed so as to satify the same require ments as previously stated in connection with slot 23.

The actuating' leverV is swingable about the axis of the shaft 25, and if desired, may be keyed to said shaft. rThe shaft 25 is journaled in an end casting 2G (see Fig. 3) here shown as suitably supported by the housing 2T. The other end of the shaft 25 is provided with a bearing- 28, which may be suitably supported in anv desired manner. tigidly associated with the actuating lever 21 is a member 29 provided with arms 30, 31 extending laterally from said lever. The arms 30. 31 are provided with adjusting screws 32, 33 respectively and the screws with lock nuts 34, 35 respectively. The screws 32, 33 are adapted to be set up against the legs 37, 38 of an armature of magnetic material. The legs 37, 38 are here shown as forming an obtuse angle with each other and the lamin forming the elestationary the end plate 13 rigcasing 27 of the elecary Contact 52.

i nbaoss ments thereof may be punchings. The armature is mounted for pivotal movement on a shaft 25. The legs 37, 38 are operativelv related to the poles 39. 4G respectively ot the W shaped magnet 41. The poles 39, 40 ot said magnet are provided with coils 42, -13 respectively.` The central leg 44 of the W shaped magnet is preferably vbrought down into proximity with the inner ends of the legs 37, 33 in order to -improve the magnetic circuit. r1`he magnet may be supported from any stationary member as the end casting 26 and housing 27 as by means of bolts 4.5, 46

The actuating lever and consequently also the parts operatively associated therewith are biased to the position shown in Fig. 1 by means of the dogs 4T, 48 connected by means of the spring 4,9. These spring actuated dogs are operativelyv related to am` pin 50 carried by the actuating` lever and a pin 51 carried by any suitable stationary part, as the end casting 26.

The switch is here shown as provided with stationary contacts 52 Jfor one active position ot the movable switch member and contacts 53 `lor another active position of said switch member.. Contacts 52, 53 may be supported in any suitable manner, the particular construction here shown being fully disclosed and claimed in applicants co-pend ing application, Sg.. N. 413,087, tiled September 27 1920.

The operation of the electromagnetic switch ldisclosed is as fol-lows: Assuming coil 42 to be Aeffectiizelv energized. leg 38 will be attracted by pole 39 rot-ating the armature as a whole in a counter clock-wise idirectionto the position shown in Fig. During this motion the let?y 37 of the arma ture acts against the screw 32 there'bv swinging the arm 30 and .the actuating lever in a counter cloclcwise `direction aga-inst the action of .the dog 48. Movement oi the actuating lever 21 causes .the ypin 22 to push against the inner end of the slot 24. rl`he actuating lever 21 ,and the link 2O thus constitnte a Atoggle for rotating `the arm 16 of the bell cran-k 14 in a clock-wise direction. Rotation of .the crank 11 in the same direction causes the switch to move to the left, as viewed in Figs. 1 and 2, and at the same time the consequent rotation ot the stationary pivot link 3 in a counter clock-wise d'rection causes the switch member 1 to swing in a clock-wise direction bringing the contact 2 into engagement with station- The parts .are preferably so disposed that when the motion is com- 1 leted the move-able and stationary contacts will be in full butting position. That portion ot' the hereinbeore described contact actuating mechanism including the crank 11. member 6,. lever 3 and switch member 1 is fuliv described and claimed in applicant-s ltormet co-pending application S. N. 334,834, filed October 29, 1921. This ynovel actuating mechanism forms no part of the present application except in so far as it enters into and forms a part of the combinations to be hereinafter set forth in the claiins. It is moreover to be understood thatother orms oiimmediate contact actuating mechanisms may beV substituted for the one shown.

The .counter clock-wise motion of the armature is limited by the engagement oi leg 3S with pole 39. The toggle formed by lever 21v an'l link 2O is shown in Fig. 2 as Substantially in the dead Center position.- Ift will be ,apparent that by proper relative adjustments of the screws 32. 33 the actuating lever 21 may be .caused to assume angular-ly different relative position with respect to the armature than that shown in Fig. 2. Bv such adjustment1 the toggle by lever 21 and link 2O may either be caused to be under set. over set or on dead .center when Vthe armature is in fully attracted position. r[his means of adjustmentmay be also utilized to compensate for any slight inaccuracies in the manufacturing' or assembl; no of the mechanism. Referring .to Fig. 2. the slot 23 is preferably long enough so that when lthe armature is in tully attracted position the pin 22 will not come into engagement with the end of said slot.

Incase the coil 42 is provided with means Jfor cutting down 4the vcurrent therethrough, a'ltcr the armature has been brought to fully attracted position the adjustibility ot tln` toggle- .setting 'becomes especially useiul thehattractive torce of the magnet is then weaker and if the `toggle is ,suitablyl set a very small OrCeon thefarmature will be sufficient .to hold it in circuit closing position.

'It the coil 42 is `deenergized the spring 49 will cause the lever 21 to return to its initial position. As `soon as the toggle 20, 21 starts to collapse toward the position shown in Fig. 1, .the bell crank 15. 1G will be given an impulse in the counter-clockwse direction by the action rot the spring 5,4 in turning contact 2 to Vthe inclined position shown ,in Fig. 1. Then the pin 22 in moving out-ward to the left, as viewed in 2.

engages the inner end of the slotv 23. the link 18 is consequently already in motion in the lSame direction 'by reasons `ot .the inipnlse 1givent'he'bell crank.

From the foregoing. the operation when the coil 43 is energized to attract leg 37 ol the armature, will be readily understood. the link 11S and lever 21 then acting as a toggle.

In order to secure a more rigid construe tion, the various links, levers, etc., may be made double,y wherever desired. thus also preventing 'bivicklrng of the part-s. As an eX- ainple .of this7l see Ithe lever 21 in Fig, 3.

Ai t) Greater rigidity as between the armature, and lever 21 may also be secured, if desired, by providing an additional member :291, similar to member 29, having arms 301 and 311, disposed at the other end of the armature. The member 291 is here shown as mechanically connected to member 29 and. lever 21 by means of an extension of pin 50, and a pin 56. These pins also serve to rivet the member 291 to a supporting member 57, best seen in Fig. 3. The member 57 has a hole at the upper end through which the shaft 25 passes loosely.

It should be understood that it is not desired to be limited to the exact details of construction herein shown and described, for obvious modifications within the scope of the appended claims may occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. In combination, a double-throw switch, a. bell crank for operating said switch, an actuating lever, two slotted links for operatively connecting the respective ends ot said bell crank with said actuating lever and a pin on said actuating lever operable in said slots whereby when said actuating lever is swung one of said links, depending` on the direction of swing, with said actuating' lever, together act as a toggle to forcibly swing said bell crank.

Q. In combination, a double-throw switch, a bell crank for operating said switch, an actuating lever having a neutral position in which it substantially bisects the angle between the arms of said bell crank, a link pivoted to an arm of said bell crank and extending toward and beyond said actuating lever in neutral position, said link having a slot beginning near its end and eX- tending toward its .pivot to a point within the boundaries of said actuating lever, a similar link associated in like manner with the other arm of said bell crank and with said actuating lever, and a pin on said actuating lever operable in the slots ot said links.

3. In combination, a double throw switch and operating means therefor including a bell crank, force-applying means, means providing two toggles between said torce-applying means and said bell crank, and means whereby when said torce-applying means moves in one direction one of said toggles applies force to said bell crank to swing the same and the other toggle is inoperative.

4L. In combination, a switch comprising stationary and movable contactmembers, actuating means for said movable contact members having a limit of movement fixed by a stationary contact member, an actuating lever operatively associated with said actuating means and having an arc ot movement unlimited by said actuating means, a magnet, an armature therefor operatively associa-ted with said actuating lever, and means for adjusting the relative positions of said armature and lever.

5. In combination, a double throw movable contact member, stationary Contact members cooperable with said movable contact member, means for operating said movable contact member into engagement with either of said stationary contact members, a magnet, an armature having xed limiting positions, operatively related to said operating means, and means for equalizing the pressures between said movable contact member and said stationary contact members respectively.

G. In combination, a double-throw switch, a bell crank for operating said switch, two toggles for operating said bell crank, means whereby when either oi said toggles is effectively operated theother remains inoperative, a magnet, an armature therefor operatively connected to said toggles, and means for adjusting the relative position ot said armature and said toggles.

7. In combination, a double-throw switch, a bell crank for operating said switch, an actuating lever, two slotted links for operatively connecting the respective ends of said bell crank with said actuating lever and a pin on said actuating lever operable in said slots, a magnet, an armature therefor operatively related to said lever, and means for adjusting the relative position of said armature and said lever.

8. In combination, a switch, a toggle for operating' said switch, a magnet, an armature therefor operatively related to said toggle and movable in unison therewith, and means whereby the relative position of said armature and toggle may be adjusted so that said toggle may be set on dead center, over set, or under set.

9. In combination, a double-throw switch` a pair ot toggles for respectively operating said switch to its two positions, a magnet` an armature therefor operatively related to said toggles, and means whereby the relative position of said armature and toggles may be adjusted so that either oi' said toggles may be set on dead center, over set, or under set.

10. In combination, a switch` means tor operating said switch including a pivotally mounted armature having legs extending in opposite directions Jfrom the pivot, a switch actuating lever pivotally mounted coaxially with said armature and having portions disposed opposite said armature legs respectively, set screws for adjusting the relative position of said armature and lever, and a magnet having` polar portions cooperating with said armature legs.

11. In combination, a double-throw switch, means for operating said switch including -a .pivotally mounted armature Shaving legs tureandle'ver, and -apairlof1toggles'fo1"reexten'ding in opposite directions Vfrom the spectively operating'said switch'to its Atwo pivot, a switch actuating lever lpivotally positions. l0 mounted coaXally with said armature and In testimony whereof,` the signature of the I having portions disposed opposite Said aiinventor is aiiixed hereto.

mature legs respectively, set screws for ad- Y justing the relative positionof said 'arma- HERBERT WV. CHENEY. 

